Under what circumstances, if any, is it possible to contribute additional money to a Rollover IRA where the funds originally came from a 401k?

Are Rollover IRA's basically considered to be Regular IRA's with regards to the annual contribution limits, criteria for eligibility, etc.?

Last question... I'm in a situation where I'm starting a new job next week. Once I'm eligible for their 401K (90 days), I'm considering rolling over a rollover IRA I have as well as my previous company's 401K just to make the bookkeeping easier on me. Is this a good idea, or would I be better served by leaving the money spread out? I realize this is a case-by-case situation, but any general advice would be appreciated.

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